<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse" >
      <caption>
        购物车
      </caption>
       <thead>
        <tr>
          <th><input type="checkbox" v-model="isAll"/> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <GouWu 
        v-for="(item,index) in goodList" :key="index"
        :name="item.name"
        :price="item.price"
        :num="item.num"  
        :index="index"
        @remove="dele"   
        @sub="subtract"
        @add="addition"
        :check="item.checked"
        />
      </tbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5"></td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import GouWu from './components/GouWu.vue'
export default {
  components: {
    GouWu,
  },
  methods:{
    dele(index){
      this.goodList.splice(index,1)
    },
    subtract(index){
      if(this.goodList[index].num>=1){
          this.goodList[index].num-=1
      }
    },
    addition(index){
      this.goodList[index].num+=1
    }
  },
  computed:{
    isAll:{
      get(){
        return this.goodList.every(item=>item.checked)//每一项都为true才返回true,只要有一项不满足，就返回false
      },
      set(val){
        this.goodList.forEach(item=>item.checked=val)
      }
    }
  },
  data() {
    return {
      goodList: [
        {
          name: '诸葛亮',
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: '蔡文姬',
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: '妲己',
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: '鲁班',
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    }
  },
}
</script>

<style>

</style>
